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Acquisitions Acquisitions (Purchase Price Breakdown) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 03, 2020
Oct. 28, 2019
Oct. 09, 2019
Aug. 28, 2018
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Business Acquisition [Line Items]                
Goodwill           $ 392,978 $ 398,292 $ 303,887
Buffalo, New York [Member]                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     $ 7,942          
Consideration transferred     15,300          
Goodwill     7,340          
Liabilities and Debt Assumed     $ 0          
Dallas, Texas [Member]                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   $ 15,878            
Consideration transferred   23,600            
Goodwill   14,226            
Liabilities and Debt Assumed   $ (6,479)            
Fairfax, Virginia [Member]                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets           34,175    
Consideration transferred       $ 102,000        
Goodwill           78,416    
Liabilities and Debt Assumed           (10,427)    
Lafayette, California [Member]                
Business Acquisition [Line Items]                
Payments to acquire businesses         $ 5,000 28,000    
Consideration transferred $ 33,000              
Goodwill 12,916         13,416    
Property, plant & equipment $ 1,720         $ 1,720